xy/x-y=1/2
x-y=2xy
3x-5xy-3y/y+3xy-x
=[3(x-y)-5xy]/[3xy-(x-y)]
=(6xy-5xy)/(3xy-2xy)
=xy/xy
=1
已知xy/x-y=1/2 求3x-5xy-3y/y+3xy-x的值!
已知xy/x-y=1/2 求3x-5xy-3y/y+3xy-x的值!
数学人气：991 ℃时间：2019-10-24 13:36:56
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